Protected metal article



J-. H. YOUNG.

PROTECTED METAL ARTICLE.

APPLICATION HLED MAILZB, 1921.

.srATEs PATENT- OFFICE. A

JAMES HOWARD YOUNG, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO K.ROBERTSON COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION (3FPENNSYLVANIA.

rnorncrnn METAL AnrrcLE.

specification ofLetters Patent. I Pate t d Jung 69 1922 Applicationfiled. March 26, 1921. Serial No. 455,970.

To all whom it may concern:

Be it known that I, YOUNG, a citizen of the United States, residiiig inPittsburgh, in the county ofAllegheny and State of Pennsylvania, have1n- .vented an Improvement in Protected Metal Articles, of which thefollowing description, in connection with the accompanying drawings, isa specification, like characters on the drawings representing likeparts.

This invention relates to a protected metal article of that character inwhich an article of corrodible metal, such as iron'or steel, isprotected against corrosion by a layer of asphalt or like bituminousmaterial alone or. 1n conjunction with layers of fibrous material,

such as asbestos, wool, or other fibrous felts.

to provide a protected metal article of the character described, whichis provided with a protective covering of homogeneous, substantiallynon-fibrous, non-metallic layers, which are not soluble in water. Asuitable covering of this character is a layer of vegetable parchment,which may be produced by the use of sulphuric acid or through the use ofzinc chloride in a manner well-known.

The covering of vegetable parchment is applied to the bituminous or likehydrocarbonaceous material, while the latter is in a tacky condition andis adhesively aflixed thereto, and forms an efi'eotive protection J AMEsHOWARD The particular featuresof the invention will be pointed out inthe claims at the end of this specification.

Fig. -1 is a plan of a protected metal art1cle embodying this invention,and

Flg. 2, a section on an enlarged scale on the line 2-2, Fig. 1.

Referring to the drawing, or represents an article of corrodible metal,such as iron or steel, which maybe rigid or flexible and of any form,and which is herein represented as ametal sheet.

' The article a is provided with a protective layer 6 of asphalt orhydrocarbonaceous material of like character, which may be ap-' pliedin. any suitable manner as by passing the article a: through a bath ofmelted asphalt. The asphalt or like layer 6 has applied to it while in atacky condition a layer 0 of vegetable parchment, preferablywaterproofed by a film d of cellulose nitrate or acetate. The lager c ishomogeneous, substantially .non-fi rous and is not soluble in water, butas it has the property of absorbing more or less water when subjectedtoa long continued wetting, it is preferred to provide the parchmentlayer 0 with the waterproofing film d. v

The layer 0 forms an effective barrier against the escape of thevolatile constitu ents of the asphalt layer 6 and also against theaction of external influences, and on account of its low cost it reducesto a minimum the cost of the protected metal article. It

also is a reflector of light and heat and can be ainted in any colorwith ordinary paints.

laims:

1. As an improved article of manufacture, a protected metal articlecomprising an article of corrodible metal, a layer of bituminous or likehydrocarbonaceous material covering said corrodible metal, and a layerof vegetable parchment adhesively aflixed to said hydrocarbonaceousmaterial.

2. As an improved article of manufacture, a protected metal articlecomprising an article of corrodible metal, a layer of bituminous or likehydrocarbonaceous material covering said corrodible metal, and a layerof waterproofed vegetable parchment adhesively aflixed to saidhydrocarbonaceous of vegetable parchment adhesively afiixed to material.said hydrecarbonaceous material and pro- 3. As an improved article ofmanufacture, vided with a, Waterproofing film. of cellulose 10 aprotected metal article comprising an arderivative. 5 tiele ofcorrodible metal, a layer of bitumi- In testimony whereqf, I have signedmy nous or like hydrocarbonaceous material name to this specificatlon.covering said corrodible metal, and a layer JAMES HOWARD YOUNG.

